Computer Tricks and Secrets

Short answer: you can hide a file inside an ordinary JPG image on Windows with a one-line Command Prompt trick: zip your files, then combine the image and the ZIP into a single picture that opens normally but secretly contains your data. It is a fun, classic trick, but it is concealment, not encryption. Here is how it works and its limits. How to do it Put the files you want to hide into a ZIP archive (e.g. secret.zip). Pick a cover image, e.g. photo.jpg. Put both in the same folder. Open Command Prompt in that folder and run: copy /b photo.jpg + secret.zip output.jpg The output.jpg opens and displays as a normal image, but the ZIP is tucked inside it. How to open the hidden files Change the file extension of output.jpg to .zip, or open it directly with a ZIP tool like 7-Zip . 7-Zip (right-click > Open archive) reads the hidden ZIP straight from the .jpg, no renaming needed. Your hidden files are inside, extract them as normal. Why it works The copy /b comman...